b9566

graph: guard iswa kq_mask on its own buffer (#24294)

A SWA-only draft head (e.g. StepFun MTP) leaves the base sub-cache
empty, so its kq_mask buffer stays null and asserts at load. Guard
each mask on its own buffer in set_input and can_reuse, base and swa.

Co-authored-by: Georgi Gerganov [email protected]

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